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- Demonstrators hurled grenades at a U.S. base in northern Afghanistan, and a gun battle left two Afghans dead and seven NATO troops injured Sunday in the escalating crisis over the burning of Muslim holy books at an American airfield.

More than 30 people have been killed, including four U.S. troops, in six days of unrest. Still, the top U.S. diplomat in Afghanistan said the violence would not change Washington’s course .

“Tensions are running very high here, and I think we need to let things calm down, return to a more normal atmosphere, and then get on with business,” Ambassador Ryan Crocker told CNN’s “State of the Union.”